| 摘要 |
The invention relates to a heat recuperator (R) for a radiating tube burner having a burner pipe and an exhaust pipe (1), the recuperator being placed at the outlet of the exhaust pipe (1) and including a heat exchanger (E) that comprises: an outgoing section (5) for directing the air to be preheated to a ferrule (6), placed on the end of the recuperator, from the fume intake side, and a return section (7) opening towards a pipe (8) for supplying air from the burner, the assembly being provided such that part of the fumes are led through, and mix with, the combustion air; the heat exchanger (E) occupies only part of the cross-section of the exhaust pipe (1), the other part (1a) of the cross-section remaining free for the fumes; the combustion air is heated by the fumes in the outgoing section (5) and in the return section (7), being radially shifted outside the outgoing section (5) and immersed in the fumes. |
| 主权项 |
1. A heat recuperator for a radiant tube burner having a burner pipe and an exhaust pipe, the burner being positioned at the inlet of the burner pipe, the heat recuperator comprising:
a connecting pipe having a first end and a second end, the first end coupled to the outlet of the exhaust pipe such that flue gases flow from the first end of the connecting pipe toward the second end; a heat exchanger positioned inside and occupying a first part of a cross section of the connecting pipe, a second part of the cross section remaining free for the passage of the flue gases toward a discharge of the connecting pipe, the heat exchanger comprising:
an outbound section for directing air for combustion from an inlet at the second end of the connecting pipe toward the first end of the connecting pipe, the outbound section comprising a plurality of exchanger tubes arranged parallel to the axis of the connecting pipe for the passage of air for combustion, each exchanger tube including a tube wall, at least part of each tube wall forming a boundary between the air for combustion flowing toward the first end of the connecting pipe and at least part of the flue gases flowing toward the second end of the connecting pipe, such that the part of the flue gases provide counter-current preheating of the air for combustion across the tube walls;a ferrule positioned at the end of the heat exchanger nearest the first end of the connecting pipe and coupled to the plurality of exchanger tubes of the outbound section, the exchanger tubes opening to the inside of the ferrule; anda return section having an ejector end opening toward a line supplying the burner with air and an open end opposite the ejector end facing the ferrule, the return section being formed of a single tube which is radially offset in relation to the exchanger tubes of the outbound section, the cross sections of the plurality of exchanger tubes and of the single tube of the return section being situated on the outside of one another, and the cross section of the single tube of the return section being at least equal to the sum of the cross sections of the plurality of exchanger tubes, wherein:
the ferrule is configured to reverse the direction of flow of the air for combustion from the plurality of exchanger tubes into the single tube of the return section,the air for combustion within the single tube of the return section flows from the ferrule toward the second end of the connecting pipe,the single tube of the return section includes an open end at the end of the heat exchanger nearest the first end of the connecting pipe, andthe open end of the single tube of the return section is spaced apart from the ferrule, such that the open end is fluidically coupled with the ferrule and with the flue gas inlet end of the exhaust pipe to entrain and mix part of the flue gases with the combustion air at the open end of and within the single tube of the return section. |
